Based on
[KeyCloak's Design Document](https://github.com/keycloak/keycloak-community/blob/main/design/oauth2-device-authorization-grant.md)

```
$ curl -s "https://id.tilde.green/realms/tgci/.well-known/openid-configuration" |jq '.'
```

```
{
  "issuer": "https://id.tilde.green/realms/tgci",
  "authorization_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/auth",
  "token_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/token",
  "introspection_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/token/introspect",
  "userinfo_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/userinfo",
  "end_session_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/logout",
  "frontchannel_logout_session_supported": true,
  "frontchannel_logout_supported": true,
  "jwks_uri": "https://id.tilde.green/realms/tgci/protocol/openid-connect/certs",
  "check_session_iframe": "https://id.tilde.green/realms/tgci/protocol/openid-connect/login-status-iframe.html",
  "grant_types_supported": [
    "authorization_code",
    "implicit",
    "refresh_token",
    "password",
    "client_credentials",
    "urn:openid:params:grant-type:ciba",
    "urn:ietf:params:oauth:grant-type:device_code"
  ],
  "acr_values_supported": [
    "0",
    "1"
  ],
  "response_types_supported": [
    "code",
    "none",
    "id_token",
    "token",
    "id_token token",
    "code id_token",
    "code token",
    "code id_token token"
  ],
  "subject_types_supported": [
    "public",
    "pairwise"
  ],
  "id_token_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512"
  ],
  "id_token_encryption_alg_values_supported": [
    "RSA-OAEP",
    "RSA-OAEP-256",
    "RSA1_5"
  ],
  "id_token_encryption_enc_values_supported": [
    "A256GCM",
    "A192GCM",
    "A128GCM",
    "A128CBC-HS256",
    "A192CBC-HS384",
    "A256CBC-HS512"
  ],
  "userinfo_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512",
    "none"
  ],
  "userinfo_encryption_alg_values_supported": [
    "RSA-OAEP",
    "RSA-OAEP-256",
    "RSA1_5"
  ],
  "userinfo_encryption_enc_values_supported": [
    "A256GCM",
    "A192GCM",
    "A128GCM",
    "A128CBC-HS256",
    "A192CBC-HS384",
    "A256CBC-HS512"
  ],
  "request_object_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512",
    "none"
  ],
  "request_object_encryption_alg_values_supported": [
    "RSA-OAEP",
    "RSA-OAEP-256",
    "RSA1_5"
  ],
  "request_object_encryption_enc_values_supported": [
    "A256GCM",
    "A192GCM",
    "A128GCM",
    "A128CBC-HS256",
    "A192CBC-HS384",
    "A256CBC-HS512"
  ],
  "response_modes_supported": [
    "query",
    "fragment",
    "form_post",
    "query.jwt",
    "fragment.jwt",
    "form_post.jwt",
    "jwt"
  ],
  "registration_endpoint": "https://id.tilde.green/realms/tgci/clients-registrations/openid-connect",
  "token_endpoint_auth_methods_supported": [
    "private_key_jwt",
    "client_secret_basic",
    "client_secret_post",
    "tls_client_auth",
    "client_secret_jwt"
  ],
  "token_endpoint_auth_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512"
  ],
  "introspection_endpoint_auth_methods_supported": [
    "private_key_jwt",
    "client_secret_basic",
    "client_secret_post",
    "tls_client_auth",
    "client_secret_jwt"
  ],
  "introspection_endpoint_auth_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512"
  ],
  "authorization_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512"
  ],
  "authorization_encryption_alg_values_supported": [
    "RSA-OAEP",
    "RSA-OAEP-256",
    "RSA1_5"
  ],
  "authorization_encryption_enc_values_supported": [
    "A256GCM",
    "A192GCM",
    "A128GCM",
    "A128CBC-HS256",
    "A192CBC-HS384",
    "A256CBC-HS512"
  ],
  "claims_supported": [
    "aud",
    "sub",
    "iss",
    "auth_time",
    "name",
    "given_name",
    "family_name",
    "preferred_username",
    "email",
    "acr"
  ],
  "claim_types_supported": [
    "normal"
  ],
  "claims_parameter_supported": true,
  "scopes_supported": [
    "openid",
    "address",
    "groups",
    "roles",
    "acr",
    "web-origins",
    "microprofile-jwt",
    "profile",
    "email",
    "offline_access",
    "phone",
    "basic"
  ],
  "request_parameter_supported": true,
  "request_uri_parameter_supported": true,
  "require_request_uri_registration": true,
  "code_challenge_methods_supported": [
    "plain",
    "S256"
  ],
  "tls_client_certificate_bound_access_tokens": true,
  "revocation_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/revoke",
  "revocation_endpoint_auth_methods_supported": [
    "private_key_jwt",
    "client_secret_basic",
    "client_secret_post",
    "tls_client_auth",
    "client_secret_jwt"
  ],
  "revocation_endpoint_auth_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "HS256",
    "HS512",
    "ES256",
    "RS256",
    "HS384",
    "ES512",
    "PS256",
    "PS512",
    "RS512"
  ],
  "backchannel_logout_supported": true,
  "backchannel_logout_session_supported": true,
  "device_authorization_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/auth/device",
  "backchannel_token_delivery_modes_supported": [
    "poll",
    "ping"
  ],
  "backchannel_authentication_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/ext/ciba/auth",
  "backchannel_authentication_request_signing_alg_values_supported": [
    "PS384",
    "RS384",
    "EdDSA",
    "ES384",
    "ES256",
    "RS256",
    "ES512",
    "PS256",
    "PS512",
    "RS512"
  ],
  "require_pushed_authorization_requests": false,
  "pushed_authorization_request_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/ext/par/request",
  "mtls_endpoint_aliases": {
    "token_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/token",
    "revocation_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/revoke",
    "introspection_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/token/introspect",
    "device_authorization_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/auth/device",
    "registration_endpoint": "https://id.tilde.green/realms/tgci/clients-registrations/openid-connect",
    "userinfo_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/userinfo",
    "pushed_authorization_request_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/ext/par/request",
    "backchannel_authentication_endpoint": "https://id.tilde.green/realms/tgci/protocol/openid-connect/ext/ciba/auth"
  },
  "authorization_response_iss_parameter_supported": true
}
```

If the URLs that I've used don't work, request the openid-configuration
endpoint, and take the URLs manually.

```
$ curl -s -X POST \
    -d "client_id=longlivedToken" \
    "https://id.tilde.green/realms/tgci/protocol/openid-connect/auth/device" | jq '.'
```

```
{
  "device_code": "<device_code>",
  "user_code": "<usercode>",
  "verification_uri": "https://id.tilde.green/realms/tgci/device",
  "verification_uri_complete": "https://id.tilde.green/realms/tgci/device?user_code=<usercode>",
  "expires_in": 600,
  "interval": 5
}
```

```
$ curl -s -X POST \
    -d "grant_type=urn:ietf:params:oauth:grant-type:device_code" \
    -d "client_id=longlivedToken" \
    -d "device_code=<device_code>" \
    "https://id.tilde.green/realms/tgci/protocol/openid-connect/token" | jq '.'
```

```
{
  "access_token": "YOUR_ACCESS_TOKEN",
  "expires_in": 473039798,
  "refresh_expires_in": 0,
  "token_type": "Bearer",
  "not-before-policy": 0,
  "session_state": "UUID",
  "scope": "profile"
}
```